Seiya was trained to become a Saint of Athena, who is in charge of protecting the Earth from some of the other gods who would take it as part of their domain. Those gods include Hades, Artemis, and Poseidon. Seiya fights very tough battles but ends up successful through the help of his friends and his love for the Earth and his devotion to Athena. His determination has led to his overpowering gods.

In Saint Seiya Omega he wears the Sagittarius cloth, and he is considered a Legendary Saint.